import { constantRoutes } from "@/router";
import { getRouters } from "@/api/menu";
import Layout from "@/layout/index";

const permission = {
  state: {
    routes: [...constantRoutes],
    addRoutes: [],
  },
  mutations: {
    SET_ROUTES: (state, routes) => {
      state.addRoutes = routes;
      state.routes = constantRoutes.concat(routes);
    },
  },
  actions: {
    // 生成路由
    GenerateRoutes({ commit }) {
      return new Promise((resolve) => {
        // 向后端请求路由数据
        getRouters().then((res) => {
          const accessedRoutes = filterAsyncRouter(res.data);
          accessedRoutes.push({ path: "*", redirect: "/404", hidden: true });
          commit("SET_ROUTES", accessedRoutes);
          resolve(accessedRoutes);
        });
      });
    },
  },
};

// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter(asyncRouterMap) {
  return asyncRouterMap.filter((route) => {
    if (route.component) {
      // Layout组件特殊处理
      route.meta = {...route.meta,menuId:route.menuId}
      if (route.component === "Layout") {
        route.component = Layout;
      } else {
        route.component = loadView(route.component);
      }
    }
    if (route.children != null && route.children && route.children.length) {
      route.children = filterAsyncRouter(route.children);
    }
    return true;
  });
}

export const loadView = (view) => {
  // 路由懒加载
  return (resolve) => require([`@/views/${view}`], resolve);
};

export default permission;
